【java多线程】分段阶乘计算

阶乘线程类：Factorial.java
需要返回值，故实现Callable接口，call()返回计算结果

import java.util.concurrent.Callable;public class Factorial implements Callable<Object>{    private long val1;    private long val2;    private long sum;    private long time;    public Factorial(long val1, long val2) {        this.val1 = val1;        this.val2 = val2;    }    public  void  sum() throws InterruptedException {        long temp =val1;        for (long i = 1; i < val2 - val1 + 1; i++) {            temp *= (val1+i);        }        sum = temp;    }    @Override    public Object call() throws Exception {        System.out.println("线程 "+ Thread.currentThread().getName() + ":运行，计算"+val1+"~"+val2+"的阶乘");        long t1 = System.currentTimeMillis();        sum();        long t2 = System.currentTimeMillis();        time = t2 - t1;        System.out.println("线程 "+ Thread.currentThread().getName() + ":结束，执行时间"+time+"ms");        return sum;    }    public long getTime() {        return time;    }    public void setTime(long time) {        this.time = time;    }}

Main.java:

public class Main {    public static void main(String[] args) throws InterruptedException, ExecutionException {            Factorial c = new Factorial(1,10);            FutureTask<Object> result = new FutureTask<Object>(c);            new Thread(result).start();            Factorial c2 = new Factorial(11,20);            FutureTask<Object> result2 = new FutureTask<Object>(c2);            new Thread(result2).start();            long a = (long) result.get();            long b = (long) result2.get();            System.out.println("sum : "+(a*b));    }}